[MlMt] limit the oldest message to be kept locally?

[Paula R. T. Coelho]

hey there,

i use MM in three different computers, office, home and laptop. in the 
laptop i’d like to limit the amount of space used by defining that, 
say, only messages 2 years back in time should be kept locally.

i’m *almost* sure i’ve seen this option somewhere in time, as a 
hidden preference? but i didn’t find it in the online manual for 
hidden preferences. was I dreaming?

p.
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